Summon forth Raigo. Whether or not he heeds the call depends entirely on the number of bloodied laurels in your crown.
The most daunting of Mado horses, Raigo eclipses its unholy brethren Goten and Ginga in both size and ferocity. As such, the creature will not suffer the burden of carrying a soul unbloodied, and therefore unworthy.
How to obtain:
Achievement -- Furious Fatalities